diff --git a/README.md b/README.md
index 15dac09..2ada548 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ __pdf_unlock.py__ removes security features from pdfs, to allow unrestricted pri
 
 ## Installation ##
 
-[Ghostscript](https://ghostscript.com) and [Poppler](https://poppler.freedesktop.org) are required.
+[Ghostscript](https://ghostscript.com) and [Poppler](http://blog.alivate.com.au/poppler-windows) are required.
 
 Windows users will have to add the binary directories to the `PATH` environment variable manually, eg:
 
diff --git a/scripts/pdf_unlock.py b/scripts/pdf_unlock.py
index ba7e29f..472a51c 100644
--- a/scripts/pdf_unlock.py
+++ b/scripts/pdf_unlock.py
@@ -56,7 +56,8 @@ def pdfinfo(pdf_name, *args):
         A dictionary containing the lines of stdout from calling 'pdfinfo'
     """
     command_str = ['pdfinfo', *args, pdf_name]
-    result = subprocess.run(command_str, stdout=subprocess.PIPE)
+    result = subprocess.run(
+        command_str, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
     stdout = result.stdout.decode('utf-8').split('\n')
 
     pdf_info = {}
@@ -76,7 +77,7 @@ def isencrypted(pdf_name):
 
     Returns:
         True if encrypted, otherwise False
-        
+
     Raises:
         AttributeError if pdf info cannot be obtained
     """