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Using google, the top hit is for "Secure Copy Protocol", but this information is probably bogus. The actual providers of scp have the following information (on the manpages provided with openssh)

NAME
    scp - secure copy (remote file copy program)

And for the protocol used:

    scp copies files between hosts on a network.  It uses ssh(1) for data
    transfer, and uses the same authentication and provides the same security

Which is as I remember it, it uses ssh (the program itself even!, not the protocol directly) in a kind of a clever way, and you don't actually need to have any kind of specific support for it installed on the server.

You do have to have a helper app installed on the SSH server; it just so happens that it's the same binary as the scp client program. JTN 21:27, 2004 Oct 2 (UTC)

For instance the following two do very similar things, and have the same result:

    ssh somepc cat myfile > myfile
    scp somepc:myfile myfile

The system for sftp does require a helper application to be present on the server.

I hope this sufficiently explains why I moved the page. Kim Bruning 13:54, 14 Jul 2004 (UTC)

Note that this is based on info from documentation by Theo de Raadt & co. It'd be interesting to hear if Tatu Ylonen (& co.) have a different story. If so, we'd be in a pickle (most used vs. first invented), but let's cross that bridge when we get to it. Kim Bruning

According to the article on SSH file transfer protocol, SCP is deprecated. This article (on SCP) does, however not state anything of that kind.

If SCP is indeed considered deprecated, I would expect that to be clearly mentioned, somewhere at the top. -- Ernstdehaan 08:12, 9 May 2007 (UTC)[reply]

SCP works over SSH-1, the older, deprecated version of SSH. Hawkeye7 22:46, 6 November 2007 (UTC)[reply]

Pulled some hair out trying to figure this one out. I though the information was important enought to include in the article. 12.108.21.226 (talk) —Preceding undated comment added 20:12, 23 October 2012 (UTC)[reply]