diff --git a/src/app.cpp b/src/app.cpp
index 8b8c031..9ce4f25 100644
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -235,13 +235,12 @@ void App::download(std::string url, std::string dest_filepath, std::function<voi
 
 bool App::check_license()
 {
-    return true; // TODO: for distribuiton only
+//    return true; // TODO: for distribuiton only
 
-/*
     CURL *curl = curl_easy_init();
     if (curl)
     {
-        std::string url = "http://omigamedev.com/panopainter/79516B99-8E67-40AD-B12F-149A5A9C2E15";
+        std::string url = "http://panopainter.com/license/53C5DE19-7B8F-42B8-8399-C99D28B66401.php";
         //std::string url = "https://panopainter.com/license/E8EDC2FE-E1BD-4AB1-91BD-FCCD926739BD.php"; // wacom
         //std::string url = "https://panopainter.com/license/A744FBA9-BC6C-43C8-BD24-0CCE24B3D985.php"; // others
 
@@ -265,7 +264,6 @@ bool App::check_license()
             return true;
     }
     return false;
-*/
 }
 
 void App::upload(std::string filename, std::string name, std::function<void(float)> progress)
@@ -340,12 +338,16 @@ void App::init()
     LOG("GL vendor: %s", glGetString(GL_VENDOR));
     LOG("GL renderer: %s", glGetString(GL_RENDERER));
 
-//     GLint n_exts;
-//     glGetIntegerv(GL_NUM_EXTENSIONS, &n_exts);
-//     for (int i = 0; i < n_exts; i++)
-//     {
-//         LOG("%s", glGetStringi(GL_EXTENSIONS, i));
-//     }
+    GLint n_exts;
+    glGetIntegerv(GL_NUM_EXTENSIONS, &n_exts);
+    for (int i = 0; i < n_exts; i++)
+    {
+        std::string ext = (const char*)glGetStringi(GL_EXTENSIONS, i);
+        if (ext.find("debug") != std::string::npos)
+        {
+            LOG("%s", glGetStringi(GL_EXTENSIONS, i));
+        }
+    }
 
     LOG("Screen Resolution: %dx%d", (int)width, (int)height);