Can anyone shed light on what the protected list means? Are players on it not allowed to sign with any other teams until a certain date?
Pretty much a waste of time. Only thing it means is you can choose up to 8 guys from that list to give a qualifying offer to. They can sign with another team I think in August sometime if they want.
Mostly it doesn't mean much, but it depends on the player's situation. In order to put a player on your season ending roster (which comes out June 15) you have to have him on your protected list first, so this is the first step in holding the rights of active players. However, for players who aren't active in the ECHL (retired, suspended, went to Europe, signed in the NHL/AHL), you can continue to hold their rights from year to year by putting them on the protected list. They aren't listed on the season ending roster, and you don't have to make them an offer.
The season ending roster is the list of 20 active ECHL players that you can make qualifying offers to. You can also just sign them to a contract. So, out of the 20 on the roster, maybe the team signs 5 to actual contracts, then makes qualifying offers to another 8, so now they hold the rights to 13. They don't have to announce those 5 contracts, so you don't really know how many of the 20 they actually hold the rights to. For non-veterans, a qualifying offer holds their rights for an entire season. For veterans who receive a qualifying offer, they become restricted free agents at the beginning of August, and unrestricted free agents at the end of of August.
So, it is complicated - and this list really doesn't mean much, more of an internal memo between the teams and the league to clarify who owns which players rights. I'm not sure why they release it to the public, because it just confuses people when they see players on there who didn't play for the team (retired, suspended, etc), or don't see players who did (NHL/AHL contracts on assignment)