=head1 NOTE
-Certain conditions have to be observed to securely use stream ciphers.
-It is not permissible to perform multiple encryptions using the same
-key stream.
+Applications should use the higher level functions
+L<EVP_EncryptInit(3)> etc. instead of calling these
+functions directly.
+
+It is difficult to securely use stream ciphers. For example, do not perform
+multiple encryptions using the same key stream.
=head1 SEE ALSO
-L<blowfish(3)|blowfish(3)>, L<des(3)|des(3)>, L<rc2(3)|rc2(3)>
+L<EVP_EncryptInit(3)>
+
+=cut
+
+=head1 COPYRIGHT
-=head1 HISTORY
+Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
-RC4_set_key() and RC4() are available in all versions of SSLeay and OpenSSL.
+Licensed under the OpenSSL license (the "License"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
=cut