In computer networks, downloader means a tool  to receive data from a remote system, typically a server such as a web server, an FTP server, an email server, or other similar system. This contrasts with uploading or transferring files from desktop to server, where data is sent to a remote server. A download is a document offered for downloading or that has been downloaded, or the process of receiving such a document.

Downloading by and large exchanges whole records for neighborhood stockpiling and sometime in the future, as differentiated with streaming, where the information is utilized almost quickly, while the transmission is as yet in advancement, and which may not be put away long haul. Sites that offer streaming media or media showed in-program, for example, Facebook increasingly place limitations on the capacity of clients to save these materials to their PCs after they have been gotten. 

Downloading isn't the equivalent as data move; moving or replicating information between two stockpiling gadgets would be data move, but receiving data from the Internet is downloading.

Copyright :

Using a Downloader to get media records includes the utilization of connecting and outlining Internet material, and identifies with copyright law. Streaming and downloading can include causing duplicates of works that to encroach on copyrights or different rights, and associations running such sites may turn out to be vicariously obligated for copyright encroachment by making others do as such. 

Open facilitating workers permits individuals to transfer records to a focal worker, which causes transmission capacity and hard plate space costs because of documents produced with each download. Unknown and open facilitating workers make it hard to consider has responsible. Making a legitimate move against the innovations behind unapproved "record sharing" has demonstrated effective for incorporated organizations, (for example, Napster), and indefensible for decentralized organizations like (Gnutella, BitTorrent). 

Downloading and streaming identifies with the more broad use of the Internet to encourage copyright encroachment otherwise called "programming robbery". As plain static facilitating to unapproved duplicates of works (for example concentrated organizations) is frequently rapidly and uncontroversially rebuked, lawful issues have as of late would in general arrangement with the use of dynamic web innovations (decentralized organizations, trackerless BitTorrents) to go around the capacity of copyright proprietors to straightforwardly draw specifically wholesalers and customers.

Litigations in European Union

In Europe, the Court of Justice of the European Union (CJEU) has ruled that it is legal to create temporary or cached copies of works (copyrighted or otherwise) online. The ruling relates to the British Meltwater case settled on 5 June 2014.

The judgement of the court states that: "Article 5 of Directive 2001/29/EC of the European Parliament and of the Council of 22 May 2001 on the harmonisation of certain aspects of copyright and related rights in the information society must be interpreted as meaning that the copies on the user’s computer screen and the copies in the internet ‘cache’ of that computer's hard disk, made by an end-user in the course of viewing a website, satisfy the conditions that those copies must be temporary, that they must be transient or incidental in nature and that they must constitute an integral and essential part of a technological process, as well as the conditions laid down in Article 5 of that directive, and that they may therefore be made without the authorisation of the copyright holders."