No3x

Sorry for my late response. The method name is corrected now. But the problem is still present.
The Post hast the restriction REQ_A.
In the user_can_read_post() method the variable $read_caps has the value:
[0] => "REQ_A"
Everything is fine so far.
In the foreach each required post cap is checked against the users capabilities. The return value is always false.

I was able to fix the problem with this patch: (the injectRegistered part)

$user_capability_table  = _groups_get_tablename( "user_capability" );

            $limit = $wpdb->get_var( "SELECT COUNT(*) FROM $group_table" );
            if ( $limit === null ) {
                $limit = 1;
            }

            // note that limits by blog_id for multisite are
            // enforced when a user is added to a blog
            $user_groups = $wpdb->get_results( $wpdb->prepare(
                "SELECT group_id FROM $user_group_table WHERE user_id = %d",
                Groups_Utility::id( $this->user->ID )
            ) );
if($this->user->ID != 0) {
            // the previous statement only covers user<->group dependencies created by the groups plugin but not the 'registered' dependency because it is not stored in the database.
            $injectRegistered = new stdClass(); //use same return type as db layer
            $injectRegistered->group_id = 1; //group_id for 'registered' is always 1
            $user_groups[] = $injectRegistered;
}
            // get all capabilities directly assigned (those granted through
            // groups are added below
            $user_capabilities = $wpdb->get_results( $wpdb->prepare(
                "SELECT c.capability_id, c.capability FROM $user_capability_table uc LEFT JOIN $capability_table c ON c.capability_id = uc.capability_id WHERE user_id = %d",
                Groups_Utility::id( $this->user->ID )
            ) );

My plugin version is 1.3.11. Afaik there where no changes in this file in the new version. I can’t update to the newest version because I have to fill in the post restrictions by JS. I was not able to do this in the newest version because of the usage of selectize js lib.

Hello, thank you very much for your help.
But the mentioned hook is not usefull for my requirements. I don’t want to show the download at all, if the user has not the caps. The download shouldn’t appear on the whole blog.
So I have to check far before edd_process_verified_download.
Do you have an idea?