Klaus,
The most common way of syndicating content is by using RSS or some other XML-format. But (other) web services are catching on.
As for full content, you will need to find a way to send images. Could wrap it all up in a SOAP message, for example (but would need to develop such system)
As for protection, there are various ways of securing the feeds. A simple way would be to build each custom feed in a seperate directory and use htaccess to protect that directory. If we had a SOAP/XML-RPC interface, you could easily add protection -- like Google, who who controls the web services by giving each user a unique ID.
The most common way of syndicating content is by using RSS or some other XML-format. But (other) web services are catching on.
As for full content, you will need to find a way to send images. Could wrap it all up in a SOAP message, for example (but would need to develop such system)
As for protection, there are various ways of securing the feeds. A simple way would be to build each custom feed in a seperate directory and use htaccess to protect that directory. If we had a SOAP/XML-RPC interface, you could easily add protection -- like Google, who who controls the web services by giving each user a unique ID.