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Web Scraping – Search engines, such as Google, have long used so-called web crawlers or crawlers, which scan the Internet for user-defined terms. Crawlers are particular types of bots, which visit one web page after another to generate associations with search terms and categorize them. The first web crawler creates as early as 1993 when the first search engine introduces – Jumpstation.

These tracking techniques include web scraping or web harvesting. We explain how it works, what it is for, and how it can be blocked if necessary.

Web Scraping: Definition

The web scraping (from the English scraping = scratching/scraping) extracts and stores data to analyze web pages or use them elsewhere. Through this web scraping, various types of information are stored: for example, contact information, such as email addresses or phone numbers, or also search terms or URLs. These store in local databases or tables.

How does Web Scraping Work?

There are different modes of operation within scraping, although there is generally a difference between automatic and manual scraping. The scraping manually defines the manual copying and pasting information and data, as one who cuts and keeps newspaper articles and only carried out if you want to find and store some specific information. It is a very laborious process that is rarely applied to large amounts of data.

In the case of automatic scraping, software or an algorithm analyzes different web pages to extract information. Specialized software is used depending on the type of web page and content. Within automatic scraping, there are several ways of proceeding:

• Parser: parsers (or parsers ) are used to convert text into a new structure. For example, in HTML parsing, the software reads an HTML document and stores the information. A DOM parser uses client-side content rendering in the browser to extract data.
• Bots: a bot is software dedicate to performing specific tasks and automating them. In the case of web harvesting, bots to browse web pages and collect data automatically.
• Text: Those with experience with the command line can use the Unix grep function to search the web for specific terms in Python or Perl. This is a straightforward method of extracting data, although it requires more work than using the software.

For what Purpose is Web Scraping Used?

In this way, employing data harvesting, a company can examine all the products of a competitor and compare them with its own. Web scraping is also valuable concerning financial data: it is possible to read data from an external website, organizing them in tabular form, and then analyze and process them.

Google is an excellent example of web scraping. The search engine uses this technology to display weather information or price comparisons for hotels and flights. Many of today’s price comparison portals also use scraping to represent information from different websites and providers.

Is Web Scraping Legal?

The scraping is not always legal. First of all, scrapers must take into account the intellectual property rights of websites. Web scraping has very negative consequences for some shopping online and suppliers, for example, if your page’s ranking is affecte because of aggregators. Therefore, it is not uncommon for a company to sue a comparison portal to prevent web scraping. In one of these cases, the Frankfurt Regional High Court ruled in 2009 that an airline should allow scraping by comparative outlets because, after all, your information is freely accessible. However, the airline had the possibility of resorting to technical measures to avoid it.

Therefore, the scraping is legal provided that the data collected are freely available to third parties on the web.

• Observe and comply with intellectual property rights. If these rights protect the data, it cannot be publishe anywhere else.
• The operators of the pages have the right to resort to technical processes to avoid web scraping that cannot be circumvente.
• If user registration or a contract of use require to benefit data, these data may by scraping.
• Hiding of advertising, terms and conditions, or disclaimers through scraping technologies are not allow.

Although scraping is allow in many cases, it can use for destructive or even illegal purposes. For example, this technology is often to send spam. For example, senders can take advantage of it to accumulate email addresses and send spam messages to these recipients.

How can web Scraping be Block?

To block scraping, website operators can take different measures. For example, the robots.txt file to block search engine bots. Therefore, the scraping machine is also prevent by bots of software. It is also possible to stop the IP addresses of bots.

In addition, numerous anti-bot payment service providers can establish a firewall.

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Definition SMTP Server

They are the acronym for “simple mail transmission protocol.” But, there is nothing simple for numerous of us: it is an additional practical term that is very unclearly understood. In reality, SMTP is part of the expertise that many of us use today regularly. What is an SMTP server, and what is it used? We will tell you.

The SMTP attendant is a computer in charge of loud out the SMTP service, temporary as an “electric postman.” It allows the conveyance of that email over the Internet. SMTP relay works very simply: if the SMTP server authorizes the sender and addressee identities, then the distribution is done.

Let’s say it’s like the web pole office: it collects the sender’s email and brings it to the recipient’s local post workplace, which is another SMTP server. It was born in 1982 and lasts to be the most extensively used Internet standard today.

To break this unhappy a bit more, let’s imagine the route your regular email would have to do at snail speed to reach its destination.

How does SMTP relay work?

We will explain the operation of the SMTP relay in a little more detail.

When an email is through the SMTP relay protocol, the validation of a series of text commands (of the ASCII character string) are subsequently sent to an SMTP server. Port 25 or 587 are generally using.

In this process, the content email does not come into play, but the attention of the SMTP language defines exclusively in the transmission.

Every time an email is sent using the SMTP protocol, a new session of the SMTP relay service is opening. Then, a series of information exchanges are carried out between the email client and the destination SMTP server, as if it were a conversation.

SMTP Commands

The conversation occurs using elementary text commands. The most mutual are the following:

• HELO: to open a meeting with the server.
• EHLO: to open a session in case the server supports extensions defined in RFC 1651.
• MAIL FROM: to indicate who is sending the message.
• RCPT TO: to display the recipient of the message.
• DATA: to predict the beginning of the message, it will end when there is a line with only a dot.
• QUIT: to close the session.
• RESET: Aborts the current transaction and deletes all records.
• SEND: Initiates a transaction in which the message is delivered to a terminal.
• VRFY: Request the server to verify an entire argument.
• EXPN: Asks the server to confirm the opinion.
• HELP: This allows you to request information about a command.

Let’s look at an example of a friendly conversation between the email client and the SMTP server.

This exchange is initiated by the “EHLO” command, followed by the “MAIL FROM” command. MAIL FROM command will allow us to identify the sender.

Next, it is sent with the «RCPT» command that allows the server to identify the recipient. Then the «DATA» command, through which the content of the email is sent.

Finally, the command “QUIT” is sent, indicating the end of the exchange and the conversation between the email sending client and the server.

Every time this process occurs, the SMTP server will send the responses of these clients by email to warn if the commands are valid or not.

What type of SMTP server should you choose?

Use your SMTP server:

Establishing and maintaining an own SMTP server is usually an option for companies concerned with security and process control. Also as well as reliability of the service, as they sometimes do not know the standards that external providers can offer.

However, having your SMTP server is a task that can quickly become expensive and time-consuming. Using our technology implies allocating resources to its management and maintenance, and we cannot always count on the most outstanding advances or the best functions.

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Choosing The Best Drone The Easy Way

Although currently, drones continue to have a more professional than jovial function, but there are more and more fans of flying these unmanned aerial vehicle systems to enjoy their leisure time, take pictures, or even compete.

The truth is that its popularity is increasing, and in the market, we can find drones of many sizes, with very different functionalities and weights.

For that reason, if you are annoying to find the best drone on the market, you have come to the right place.

If you are looking for a drone that adapts to the use you want to give it and you want to see all the details, images, and reviews about it, we offer you complete reviews of the best in this type of device.

On this sheet, you will find a full list of the most valued drones of the year 2021 and more related articles so that you can choose the one that best suits your specific needs and tastes.

Current Legislation Regarding Drones

At the beginning of this year, the new European regulation (2020/1058) regulating the use of crewless spacecraft came into force, including drones used for photography and video and maintaining the premise that it is only possible to fly a drone within authorized and restriction-free zones. Still, it establishes a new category system and the requirements that are necessary to fly drones legally.

Therefore, we must be very attentive and know first-hand the possible restrictions or details of the legislation.

UAS Drone Pilot License

In 2021, the Official Drone Pilot License is applicable for Security Forces and Bodies (FCS); While, for the rest of the people, in the case of drones from 250 grams, the certificate that proves a minimum of knowledge is mandatory and that allows the flight in the different established categories.

According to this: to pilot drones in the open category of the new UAS Regulation, it is mandatory to pass the AESA exam, Level 1 or Level 2, depending on the risk of the operation.

And to fly in a specific category, the AESA Level 3 exam.

Necessary Requirements to Fly a Drone

Professional Use

To be able to make professional use of the drone in, you need:

• AESA operational certification.
• Drone pilot license (theoretical and practical exam)
• Driver title suitable to handle the model in question.
• Liability insurance.
• Medical certificate.

Domestic use

To be able to make domestic use of the drone, you need:

• Maintain a minimum flight distance from airports of 8 kilometers.
• Respect the limitations of controlled airspaces
• Do not exceed 120 meters in height at ground level.
• Before the night, the flight was prohibited. However, the new legislation allows it, although the flight should not go above 50 meters in height at night.
• Flights will take place within the visual range of the user.
• For 250-gram drones, flights are allowed at the height of no more than 20 meters and a safe distance from the buildings.
• Liability insurance is not mandatory for drones under 250 grams for recreational purposes.
• Respect the areas of controlled or restricted flight.

Drones less than 250 gr

• It is allowed to use the drone in urban areas, crowds of people, or buildings, but less than 20 meters high from the ground.
• It is forbidden to fly in National Parks, wildlife conservation areas, Biosphere Reserves, and other protected natural spaces.
• Flying is not allowed within an 8 km radius of any airport, airfield, or other controlled airspaces.
• If the drone has a camera, the Data Protection Law and the Right to Honor and Privacy must comply.

Use Of Drones And Data Protection

The requirements that must be met concerning the Data Protection law are:

• Inform before recording anyone and respect privacy.
• Avoid sharing images that may have unfair or harmful consequences for people’s privacy.

Two Examples

The Best Cheap Drones

1.     Tomzon D25 RC, the camera drone for beginners,

This drone is perfect for getting started in the world of drones and comes with a built-in 4K camera with light positioning. You can take pictures by hand gestures. It has a route flight option, 3D flips, MV mode, and 2 Batteries. The flight time is approximately 24 minutes. Check all the functionalities and technical details here to see if it is the drone you would like to buy to start this fun hobby.

Information And Technical Data

• 4K camera: 4K super HD camera with a maximum resolution of 4096 x 2160P. Filter photos and music on videos to create your MV in the application.
• Dual cameras, optical flow: The functions of the optical flow and altitude hold mode allow the flight to be more stable and prevent the drone from rocking when it is hovering in the air.
• Taking photos with hand gesture: Use a hand gesture “Victory” sign to take a picture and face the palm of your hand or facing the front camera to record a video.
• The application supports screen divisions and “picture in picture” modes.
• Available: low and high speeds.
• Trajectory flight mode: This allows the drone to follow the route that you draw on the map screen of the application.
• 3D flip function: add more fun when flying.
• Dual Batteries: With two batteries, it provides a total flight time of 24 minutes.

2.     Yuneec – Mantis Q, The Portable And Foldable Drone With High-End Features

This drone has a portable design. It comes equipped with a 4K video camera at 30 frames per second and intelligent flight functions. You can drive around a point of interest, return home automatically using GPS and GLONASS, and have voice commands. Its remote control is simple and has a smartphone dock. Check here all its technical details and decide if it is the drone you want to buy.

Information and technical data

• Travel drone: foldable.
• Flight time: up to 33 minutes.
• Up to 72 km / h (in Sport mode)
• Includes photography bag + 3 batteries.
• Voice control.
• Flight modes: Journey, Point of Interest, Return Home.
• Visual tracking.
• Connection with social networks.
• GPS or indoor positioning.
• Quiet and energy-efficient design.
• Flight controller based on PX4.
• Weight: 500 gr

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