Seen below is a sample of  modified lsvendor.c that contains a server side checkout filter. It uses a flag that will detect if the license that is being checked out is from the Server Trusted Storage or a License file and will deny/allow accordingly.

int TS_License_out()
{
		
	char* feature;
	CONFIG * conf;


	ls_get_attr(LS_ATTR_FEATURE, &feature);
	ls_log_asc_printf("outfilter check out for lic file\n");

	conf = lc_get_config(lm_job, feature);
	printf("license type is %d\n", conf->nTSFeatFlag); //Check if license is TS or Lic file


	if (conf->nTSFeatFlag > 0) {
		ls_log_asc_printf("Allow Checkout"); // Allow if > 0(TS)
	return (1);
	}

	else {
		ls_log_asc_printf("Deny Checkout"); // Deny if 0 (Lic File)
		lc_set_errno(lm_job, -53);
		return(0);
	}

}