diff --git a/widevine/pssh.go b/widevine/pssh.go
deleted file mode 100644
index 1789761..0000000
--- a/widevine/pssh.go
+++ /dev/null
@@ -1,115 +0,0 @@
-package widevine
-
-import (
-	"bytes"
-	"encoding/base64"
-	"encoding/xml"
-	"errors"
-	"io"
-	"net/http"
-)
-
-// This function retrieves the PSSH/Init Data from a given MPD file reader.
-// Example file: https://bitmovin-a.akamaihd.net/content/art-of-motion_drm/mpds/11331.mpd
-func InitDataFromMPD(r io.Reader) ([]byte, error) {
-	type mpd struct {
-		XMLName                   xml.Name `xml:"MPD"`
-		Text                      string   `xml:",chardata"`
-		ID                        string   `xml:"id,attr"`
-		Profiles                  string   `xml:"profiles,attr"`
-		Type                      string   `xml:"type,attr"`
-		AvailabilityStartTime     string   `xml:"availabilityStartTime,attr"`
-		PublishTime               string   `xml:"publishTime,attr"`
-		MediaPresentationDuration string   `xml:"mediaPresentationDuration,attr"`
-		MinBufferTime             string   `xml:"minBufferTime,attr"`
-		Version                   string   `xml:"version,attr"`
-		Ns2                       string   `xml:"ns2,attr"`
-		Xmlns                     string   `xml:"xmlns,attr"`
-		Bitmovin                  string   `xml:"bitmovin,attr"`
-		Period                    struct {
-			Text          string `xml:",chardata"`
-			AdaptationSet []struct {
-				Text            string `xml:",chardata"`
-				MimeType        string `xml:"mimeType,attr"`
-				Codecs          string `xml:"codecs,attr"`
-				Lang            string `xml:"lang,attr"`
-				Label           string `xml:"label,attr"`
-				SegmentTemplate struct {
-					Text           string `xml:",chardata"`
-					Media          string `xml:"media,attr"`
-					Initialization string `xml:"initialization,attr"`
-					Duration       string `xml:"duration,attr"`
-					StartNumber    string `xml:"startNumber,attr"`
-					Timescale      string `xml:"timescale,attr"`
-				} `xml:"SegmentTemplate"`
-				ContentProtection []struct {
-					Text        string `xml:",chardata"`
-					SchemeIdUri string `xml:"schemeIdUri,attr"`
-					Value       string `xml:"value,attr"`
-					DefaultKID  string `xml:"default_KID,attr"`
-					Pssh        string `xml:"pssh"`
-				} `xml:"ContentProtection"`
-				Representation []struct {
-					Text              string `xml:",chardata"`
-					ID                string `xml:"id,attr"`
-					Bandwidth         string `xml:"bandwidth,attr"`
-					Width             string `xml:"width,attr"`
-					Height            string `xml:"height,attr"`
-					FrameRate         string `xml:"frameRate,attr"`
-					AudioSamplingRate string `xml:"audioSamplingRate,attr"`
-					ContentProtection []struct {
-						Text        string `xml:",chardata"`
-						SchemeIdUri string `xml:"schemeIdUri,attr"`
-						Value       string `xml:"value,attr"`
-						DefaultKID  string `xml:"default_KID,attr"`
-						Cenc        string `xml:"cenc,attr"`
-						Pssh        struct {
-							Text string `xml:",chardata"`
-							Cenc string `xml:"cenc,attr"`
-						} `xml:"pssh"`
-					} `xml:"ContentProtection"`
-				} `xml:"Representation"`
-				AudioChannelConfiguration struct {
-					Text        string `xml:",chardata"`
-					SchemeIdUri string `xml:"schemeIdUri,attr"`
-					Value       string `xml:"value,attr"`
-				} `xml:"AudioChannelConfiguration"`
-			} `xml:"AdaptationSet"`
-		} `xml:"Period"`
-	}
-
-	var mpdPlaylist mpd
-	if err := xml.NewDecoder(r).Decode(&mpdPlaylist); err != nil {
-		return nil, err
-	}
-
-	const widevineSchemeIdURI = "urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed"
-	for _, adaptionSet := range mpdPlaylist.Period.AdaptationSet {
-		for _, protection := range adaptionSet.ContentProtection {
-			if protection.SchemeIdUri == widevineSchemeIdURI && len(protection.Pssh) > 0 {
-				return base64.StdEncoding.DecodeString(protection.Pssh)
-			}
-		}
-	}
-	for _, adaptionSet := range mpdPlaylist.Period.AdaptationSet {
-		for _, representation := range adaptionSet.Representation {
-			for _, protection := range representation.ContentProtection {
-				if protection.SchemeIdUri == widevineSchemeIdURI && len(protection.Pssh.Text) > 0 {
-					return base64.StdEncoding.DecodeString(protection.Pssh.Text)
-				}
-			}
-		}
-	}
-
-	return nil, errors.New("no init data found")
-}
-
-// This function retrieves certificate data from a given license server.
-func GetCertData(client *http.Client, licenseURL string) ([]byte, error) {
-	response, err := client.Post(licenseURL, "application/x-www-form-urlencoded", bytes.NewReader([]byte{0x08, 0x04}))
-	if err != nil {
-		return nil, err
-	}
-	defer response.Body.Close()
-	return io.ReadAll(response.Body)
-}