Content Behind Paywall Considered Duplicate

[JD90]

So I've written quite a few articles for another site but those articles are behind a membership paywall. The article is indexed in Google as the title and the first two sentences are visible for non members.

If I duplicate some of the content that is behind the paywall, will that be seen as duplicate content or because the article behind the paywall isn't visible, it's ok?

 

[jentl3m4n]

try to google its hidden text content and see if the article is returned in result-set

 

[JD90]

try to google its hidden text content and see if the article is returned in result-set

Nope, doesn't return the article. Should be ok then?