Hello, Art3mis.
It is actually available on the following documentation page:
https://softvelum.com/paywall/hotlink_protection/
The code will work for SLDP the same way as for other protocols if you have "SLDP(Softvelum Low Delay)" checked in WMSAuth rule settings.
In case of ws(s):// streams, the signature should be placed right after the stream name. E.g.
wss://some.server/app/stream?wmsAuthSign=.....
Please also refer to WMSAuth FAQ on the following page:
https://softvelum.com/paywall/faq/
Thank you